Phlogopit in kalk-alkalischen lamprophyren von Nord-England

Autor:	Roger H. Mitchell, S. Jayaganapathy, H. O. A. Meyer
Rok vydání:	1994
Předmět:	Dike geography Fractional crystallization (geology) geography.geographical_feature_category Geochemistry Magma chamber Fractionation engineering.material Geophysics Geochemistry and Petrology engineering Phlogopite Mica Geology
Zdroj:	Mineralogy and Petrology. 51:227-237
ISSN:	1438-1168 0930-0708
DOI:	10.1007/bf01159728
Popis:	Phlogopite mica is the major unaltered phase in minette and kersantite dikes in the Cross Fell and Taythes inliers in northwestern England. The compositional zonation trend in the micas from Mg-rich, Cr-bearing cores to Fe, Ti, Ba-rich, low Cr margins, or rims, is similar to that reported for micas from minettes and kersantites worldwide. Complex mantling and zoning trends suggest that the phenocrystal mica assemblage is a hybrid one formed by the mixing of magmas of broadly similar composition which have undergone different amounts of fractional crystallization. The magmas are considered to have beeen produced in a continuously replenished fractionating magma chamber. The lamprophyres have a common source and were probably derived by the extensive fractionation of a basic mantle-derived magma.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1d654b0b4b79eb1a55258f29a2207162 https://doi.org/10.1007/bf01159728 Zobrazit plný text záznamu Full text from SpringerLink